Liriope or lilyturf are an unusual perennial. They look like grasses but flower like perennials. They make interesting additions to a border and look very smart drooping over an edging or wall. They flower from mid summer into the winter and are also good ground cover for a free draining site, They spread by underground shoots and pop up a few inches away with a new plant. There are some nice interesting variegated forms that will double the attraction. They like free draining soil and full sun. Growing no more the 15cm tall.